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CVE-2026-73845— CKAN MCP Server: MQA server allowlist bypass via unanchored regex (`isValidMqaServer`)

Quick assessment

Affected
ondata ckan-mcp-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

onData CKAN MCP Server是onData组织开源的一款基于模型上下文协议的数据服务组件。 onData CKAN MCP Server 0.4.112之前版本存在安全漏洞，该漏洞源于使用isValidMqaServer验证server_url参数时仅采用前缀正则表达式，导致攻击者可通过后缀主机和URL用户信息指向攻击者控制的主机并返回伪造响应。

CVSS 5.3 · Medium EPSS 0.38% · P31

Possible ATT&CK Techniques 1 AI

T1071 · Application Layer Protocol

Affected Version Matrix 1

VendorProduct Version RangeStatus
ondata ckan-mcp-server < 0.4.112 affected
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I. Basic Information for CVE-2026-73845

Vulnerability Information
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Vulnerability Title
CKAN MCP Server: MQA server allowlist bypass via unanchored regex (`isValidMqaServer`)
Source: CVE Program / CVE List V5
Vulnerability Description
CKAN MCP Server is a tool for querying CKAN open data portals. Prior to 0.4.112, the ckan_get_mqa_quality and ckan_get_mqa_quality_details tools in src/tools/quality.ts use isValidMqaServer to validate the server_url parameter with a prefix-only regular expression for dati.gov.it, allowing suffix-host and URL-userinfo values to target an attacker-controlled host and return a spoofed response. This issue is fixed in version 0.4.112.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
onData CKAN MCP Server 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
onData CKAN MCP Server是onData组织开源的一款基于模型上下文协议的数据服务组件。 onData CKAN MCP Server 0.4.112之前版本存在安全漏洞，该漏洞源于使用isValidMqaServer验证server_url参数时仅采用前缀正则表达式，导致攻击者可通过后缀主机和URL用户信息指向攻击者控制的主机并返回伪造响应。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ondata ckan-mcp-server < 0.4.112 -

II. Public POCs for CVE-2026-73845

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III. Intelligence Information for CVE-2026-73845

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Patches & Fixes for CVE-2026-73845 (2)

Vendor Advisories for CVE-2026-73845 (1)

Same Patch Batch · ondata · 2026-08-14 · 3 CVEs total

CVE-2026-73846 6.5 MEDIUM CKAN MCP Server: Cache-key canonicalization collision enables cache confusion / poisoning
CVE-2026-73844 3.7 LOW CKAN MCP Server: Information disclosure via verbose error reflection

IV. Related Vulnerabilities

Same product: ckan-mcp-server
Same vendor: ondata
Same weakness: CWE-20

V. Comments for CVE-2026-73845

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